<template>
  <div>
    <nav-bar>
      <div slot="left" class="leftIcon" @click="backClick"></div>
      <div slot="center" class="title">
        <div v-for="(item , index) in titles"
             :key="index"
             class="title-item"
             :class="{active : currentIndex === index}" @click="titleClick(index)">
          {{ item }}
        </div>
      </div>
    </nav-bar>
  </div>
</template>

<script>
import NavBar from "components/common/navbar/NavBar";

export default {
  name: "DetailNavBar",
  components: {
    NavBar
  },
  data() {
    return {
      titles: ['商品页', '参数', '评论', '推荐'],
      currentIndex: 0
    }
  },
  methods: {
    titleClick(index) {
      this.currentIndex = index;
      this.$emit('titleClick' , index);
    },
    backClick() {
      this.$router.go(-1);
    }
  }
}
</script>

<style scoped>
.title {
  display: flex;
  font-size: 13px;
}

.title-item {
  flex: 1;
}

.active {
  color: var(--color-high-text);
}

.leftIcon {
  position: relative;
}

.leftIcon::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 15px;
  width: 15px;
  height: 15px;
  border-left: 2px solid #000;
  border-bottom: 2px solid #000;
  transform: rotate(45deg);
}
</style>
